Three-dimensional printer



FIG. 1 is a top, front, right side perspective view of a three-dimensional printer showing a first embodiment of our design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a top, front, right side perspective view showing a second embodiment thereof;

FIG. 9 is a front view of FIG. 8;

FIG. 10 is a back view of FIG. 8;

FIG. 11 is a left-side view of FIG. 8;

FIG. 12 is a right-side view of FIG. 8;

FIG. 13 is a top view of FIG. 8; and,

FIG. 14 is a bottom view of FIG. 8.

The broken lines illustrate portions of the three-dimensional printer that form no part of the claimed design. 

CLAIM The ornamental design for a three-dimensional printer, substantially as shown. 